Your parents got divorced and your father found a new girlfriend who has two sons. At first you don't get along very well with them, but then you start to understand them. Heeseung and Sunghoon are a super duo of brothers. "Dad who's that lady?" You asked. "Oh it's my new girlfriend Sarah. And these are her two sons Heeseung and Sunghoon. Don't be afraid, you will get along with them..."